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The interhemispheric auditory white matter tract is associated with impulsivity.

Taylor E Stansberry1, Anne L Willliams2, Toshikazu Ikuta2

  • 1Department of Communication Disorders, Louisiana State University Health Sciences Center, New Orleans, LA, United States.

Behavioural Brain Research
|May 9, 2022
PubMed
Summary

Higher integrity of the Interhemispheric Auditory Tract (IAT) correlates with increased impulsivity, particularly sensation seeking. This suggests a link between auditory processing and behavioral control.

Keywords:
Auditory cortexCorpus callosumDiffusion tensor imagingImpulsivity

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • The link between auditory processing and impulsivity is established, but underlying mechanisms remain unclear.
  • Interhemispheric connections, specifically the Interhemispheric Auditory Tract (IAT) via the corpus callosum, are implicated in brain function.

Purpose of the Study:

  • To investigate the association between the integrity of the Interhemispheric Auditory Tract (IAT) and impulsivity.
  • To explore the relationship between white matter integrity in auditory pathways and specific facets of impulsive behavior.

Main Methods:

  • Utilized diffusion tensor imaging (DTI) to assess white matter integrity, specifically Fractional Anisotropy (FA) of the IAT.
  • Analyzed data from the Nathan Kline Institute - Rockland Sample (N=390 successful IAT tractography out of 446 individuals).
  • Correlated IAT FA with scores on the UPPS Impulsive Behavior Scale, including its subscales.

Main Results:

  • A positive association was found between IAT Fractional Anisotropy (FA) and overall impulsivity scores.
  • Sensation seeking, a subscale of the UPPS scale, showed a significant positive correlation with IAT FA.
  • Higher IAT integrity is linked to greater impulsivity and sensation-seeking tendencies.

Conclusions:

  • The integrity of the Interhemispheric Auditory Tract (IAT) is associated with impulsivity.
  • Enhanced interhemispheric auditory integration may contribute to increased impulsivity and sensation seeking.
  • This finding provides insights into the neural underpinnings of impulsivity and auditory processing.